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  Cooling fanUSPTO Application #: 20070114860Title: Cooling fan Abstract: A cooling fan includes: a casing having a surrounding wall that defines an accommodating space; a circuit board disposed in the accommodating space and including a substrate and a control circuit, the substrate having a center portion that has a peripheral edge, and a plurality of spaced apart connecting beams that extend from the peripheral edge of the center portion and that are connected directly and securely to the surrounding wall; a hollow shaft secured directly to and protruding from the circuit board into the accommodating space; a stator mounted securely on the center portion of the substrate of the circuit board and coupled to the control circuit; a fan blade unit disposed in the accommodating space and including an annular hub journalled rotatably to the hollow shaft; and a rotor mounted on the hub. (end of abstract) Agent: Davidson Berquist Jackson & Gowdey LLP - Arlington, VA, US Inventors: Chien-Jung Chen, Hsien-Wen Liu, Hui-Chao Hsu USPTO Applicaton #: 20070114860 - Class: 31006700R (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070114860. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority of Taiwanese application no. 094220317, filed on Nov. 23, 2005. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a cooling fan, more particularly to a cooling fan that has a casing and a circuit board directly connected to a surrounding wall of the casing. [0004] 2. Description of the Related Art [0005] Referring to FIGS. 1 and 2, a conventional cooling fan 1 is shown to include a casing 11, a control unit 12, a stator 13, a fan blade unit 14 and a pair of bearings 15. [0006] The casing 11 has a surrounding wall 110, a mounting base 111 extending from the surrounding wall 110, and a hollow shaft 112 fixedly mounted on the mounting base 111. [0007] The control unit 12 includes a circuit board 121 seated on a shoulder of the hollow shaft 112 and spaced apart from the mounting base 111, and a sensing component 122 provided on the circuit board 121. [0008] The stator 13 is secured to and is connected electrically to the circuit board 121 of the control unit 12. The fan blade unit 14 is rotatable relative to the stator 13. [0009] The fan blade unit 14 includes a hollow hub 141 that covers the stator 13, a rotating axle 142 disposed in the hollow hub 141 and journalled to the hollow shaft 112 of the casing 11, a plurality of blades 143 extending outwardly from the hollow hub 141, a magnetic ring 144 serving as a rotor and mounted on an inner face of the hollow hub 141. [0010] The two bearings 15 are spaced apart from each other, and are mounted in the hollow shaft 112 of the casing 11. The rotating axle 142 is journalled to the hollow shaft 112 through the bearings 15. SUMMARY OF THE INVENTION [0011] The object of the present invention is to provide a cooling fan that has a smaller size and that is less expensive to manufacture as compared to the aforesaid conventional cooling fan. [0012] Accordingly, a cooling fan of this invention comprises: a casing having a surrounding wall that defines front and rear openings for passage of fluid flow therethrough and that has an inner wall surface which defines an accommodating space; a circuit board disposed in the accommodating space and including a substrate and a control circuit, the substrate having a center portion that has a peripheral edge, and a plurality of spaced apart connecting beams that extend from the peripheral edge of the center portion and that are connected directly and securely to the inner wall surface of the surrounding wall, the control circuit being disposed on the center portion of the substrate; a hollow shaft secured directly to and protruding transversely from the circuit board into the accommodating space, and defining a rotation axis; a stator mounted securely on the center portion of the substrate of the circuit board, surrounding the hollow shaft, and coupled to the control circuit; a fan blade unit disposed in the accommodating space and including an annular hub journalled rotatably to the hollow shaft, surrounding the stator, and having an inner wall; and a rotor mounted on the inner wall of the hub and surrounding and coupled magnetically to the stator so as to rotate together with the fan blade unit about the rotation axis when the stator is actuated. BRIEF DESCRIPTION OF THE DRAWINGS [0013] Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which: [0014] FIG. 1 is an exploded perspective view of a conventional cooling fan; [0015] FIG. 2 is a sectional view taken along the line II-II in FIG. 1; [0016] FIG. 3 is an exploded perspective view of the preferred embodiment of a cooling fan according to the present invention; [0017] FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3; and [0018] FIGS. 5A to 5D are schematic views to illustrate how an assembly of a casing and a circuit board of the preferred embodiment is manufactured. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0019] Referring to FIGS. 3 and 4, the preferred embodiment of a cooling fan according to the present invention is shown to include: a casing 2 having a surrounding wall 23 that defines front and rear openings 201, 202 for passage of fluid flow there throug hand that has an annular inner wall surface 230 which defines an accommodating space 20; a circuit board 3 disposed in the accommodating space 20 and including a substrate 34 and a control circuit 31, the substrate 34 having a center portion 341 that has a peripheral edge, and a plurality of spaced apart connecting beams 33 that extend from the peripheral edge of the center portion 341 and that are connected directly and securely to the inner wall surface 230 of the surrounding wall 23, the control circuit 31 being disposed on the center portion 341 of the substrate 34; a hollow shaft 22 secured directly to and protruding transversely from the circuit board 3 into the accommodating space 20, and defining a rotation axis (L); a stator 4 mounted securely on the center portion 341 of the substrate 34 of the circuit board 3, surrounding the hollow shaft 22, and coupled to the control circuit 31; a fan blade unit 5 disposed in the accommodating space 20 and including an annular hub 51 journalled rotatably to the hollow shaft 22, surrounding the stator 4, and having an inner wall 55; and a rotor 54 mounted on the inner wall 55 of the hub 51 and surrounding and coupled magnetically to the stator 4 so as to rotate together with the fan blade unit 5 about the rotation axis (L) when the stator 4 is actuated. Continue reading... Full patent description for Cooling fan Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cooling fan patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Cooling fan or other areas of interest. ### Previous Patent Application: Cooling fan Next Patent Application: Rollen and rollenmotoren Industry Class: Electrical generator or motor structure ### FreshPatents.com Support Thank you for viewing the Cooling fan patent info. IP-related news and info Results in 2.09525 seconds Other interesting Feshpatents.com categories: Qualcomm , Schering-Plough , Schlumberger , Seagate , Siemens , Texas Instruments , |
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